Microwave Transmission

It travels at high frequency than the radio waves. It requires the sender to be inside of the receiver. It operates in a system with a low gigahertz range. It is mostly used for unicast communication.

There are 2 types of Microwave Transmission :

Terrestrial Microwave

Satellite Microwave

Advantages of Microwave Transmission

Used for long distance telephone communication

Carries 1000’s of voice channels at the same time

Disadvantages of Microwave Transmission

It is Very costly

Terrestrial Microwave

For increasing the distance served by terrestrial microwave, repeaters can be installed with each antenna .The signal received by an antenna can be converted into transmittable form and relayed to next antenna as shown in below figure. It is an example of telephone systems all over the world

There are two types of antennas used for terrestrial microwave communication :

1. Parabolic Dish Antenna

In this every line parallel to the line of symmetry reflects off the curve at angles in a way that they intersect at a common point called focus. This antenna is based on geometry of parabola.

2. Horn Antenna

It is a like gigantic scoop. The outgoing transmissions are broadcast up a stem and deflected outward in a series of narrow parallel beams by curved head.

Satellite Microwave

This is a microwave relay station which is placed in outer space. The satellites are launched either by rockets or space shuttles carry them.

These are positioned 3600KM above the equator with an orbit speed that exactly matches the rotation speed of the earth. As the satellite is positioned in a geo-synchronous orbit, it is stationery relative to earth and always stays over the same point on the ground. This is usually done to allow ground stations to aim antenna at a fixed point in the sky.

Features of Satellite Microwave :

Bandwidth capacity depends on the frequency used.

Satellite microwave deployment for orbiting satellite is difficult.

Advantages of Satellite Microwave :

Transmitting station can receive back its own transmission and check whether the satellite has transmitted information correctly.

A single microwave relay station which is visible from any point.

Disadvantages of Satellite Microwave :

Satellite manufacturing cost is very high

Cost of launching satellite is very expensive

Transmission highly depends on whether conditions, it can go down in bad weather